Analog Devices Inc. LTC2937HUHE#TRPBF

Overview

LTC2937HUHE#TRPBF from Analog Devices is a six-channel programmable power supply sequencer and voltage supervisor with EEPROM configuration and fault logging. It enables precise time- and event-based sequencing of up to six supplies, monitors ±0.75% accurate UV/OV thresholds across all channels, supports I²C/SMBus interface, and operates over –40°C to 125°C. It is used in telecom equipment for controlled multi-rail power-up of FPGAs and ASICs.

For engineers reviewing the LTC2937HUHE#TRPBF datasheet, LTC2937HUHE#TRPBF pinout, LTC2937HUHE#TRPBF application, or LTC2937HUHE#TRPBF equivalent, key selection criteria include sequencer channel count, EEPROM retention at 125°C, programmable reset delay (0–1900 ms), single-wire synchronization scalability to 300 supplies, and integrated active discharge capability per monitored rail.

Technical Context

The LTC2937HUHE#TRPBF implements dual-mode sequencing-time-based (with ton_delay/toff_delay timers) and event-based (triggered by voltage threshold crossings)-using independent UV/OV comparators per channel. Its internal 3.3V LDO regulator powers logic and I²C interface while accepting VPWR input from 4.5V to 16.5V.

Configuration and fault history are stored in on-chip EEPROM rated for 10k write cycles and 20-year data retention across the full –40°C to 125°C operating range. Synchronization between multiple devices uses two dedicated one-wire interfaces: SHARE_CLK for global timing alignment and SPCLK for coordinated sequence position handoff.

Key Specifications

Pinout & Package

28-lead (5 mm × 6 mm) plastic QFN package with exposed thermal pad (optional GND connection). Pin functions validated per Analog Devices LTC2937 Rev. B datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power supply sequencing and supervision applications.

Compared with LTC2937HUHE#TRPBF, LTC2935CUHE#TRPBF offers reduced channel count and no nonvolatile fault storage, while TPS65988DHAR embeds sequencing within a USB-C protocol stack-neither provides the same combination of 6-channel autonomous supervision, 125°C operation, EEPROM logging, and scalable synchronization.

Availability

LTC2937HUHE#TRPBF is available at Aetrix Electronics and suitable for network servers, telecom equipment, and high-availability computer systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LTC2937HUHE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The LTC2937HUHE#TRPBF belongs to Analog Devices' Power Management portfolio, designed specifically for robust, autonomous power sequencing and fault-aware supervision in mission-critical infrastructure equipment.

FAQ

What is the maximum number of power supplies that can be sequenced using LTC2937HUHE#TRPBF?

The LTC2937HUHE#TRPBF supports up to six power supplies directly. When multiple LTC2937HUHE#TRPBF devices are interconnected via the SHARE_CLK and SPCLK lines, sequencing can scale to 300 supplies across up to 50 devices. This expansion relies on synchronized timing and daisy-chained sequence position handoff, not additional channels per device.

Does LTC2937HUHE#TRPBF support negative voltage monitoring?

Yes, the LTC2937HUHE#TRPBF supports negative voltage monitoring by referencing V1–V6 inputs to VDD (3.3 V) instead of GND. Using an external resistor divider biased from VDD, negative rails such as –1.2 V or –5 V can be scaled into the device's 0.2 V to 6 V input range. The datasheet confirms this capability in the Applications Information section under "Monitor Negative Power Supplies."

How does the EEPROM fault logging work in LTC2937HUHE#TRPBF?

The LTC2937HUHE#TRPBF logs the first detected fault-including channel number, fault type (UV/OV/sequence timeout), timestamp relative to ON assertion, and threshold values-to on-chip EEPROM. This occurs automatically upon fault detection and survives power cycles. The MONITOR_STATUS_HISTORY register allows retrieval, and the CLEAR command resets the log. EEPROM endurance is rated for 10,000 writes with 20-year retention at ≤85°C.

What is the purpose of the MARGB pin on LTC2937HUHE#TRPBF?

The MARGB (Margin) pin on LTC2937HUHE#TRPBF disables the RSTB output and suppresses SUPERVISOR faults during voltage margin testing. Pulling MARGB low prevents false resets when supplies are intentionally driven outside nominal limits (e.g., +5% or –5%). This allows safe validation of system stability under stressed conditions without interrupting operation.

Can LTC2937HUHE#TRPBF operate without an external microcontroller?

Yes, the LTC2937HUHE#TRPBF is designed for autonomous operation. Its configuration-including sequencing order, timing parameters, UV/OV thresholds, and fault responses-is stored in internal EEPROM. Once programmed, it performs full power-up, supervision, and fault response without any host processor or software. The ON pin serves as a simple hardware trigger, making it ideal for headless or firmware-light systems.